Hollow-blast grate bar



HOLLOW BLAST GRATE BAR Filed April 19, 1919 Patented June 26 1923.

gATlEEi titan rar HOLLOW-BLAST GRA'I'E BAR.

Application filed April 19, 1919.

T all w/wmit may concern Be it known that I, THOMAS L. LA MALTA, a citizen of the United States, residing-at Memphis, in the county of Shelby and State of Tennessee, have invented certain new and useful Improvements in Hollow-Blast Grate Bars, of which the following is a specification.

My said invention consists in an improved construction of hollow blast or forced draft grate bars for use in steam boiler furnaces, the principal object being to provide a bar of such type which can be readily cleaned while the furnace is in operation; and also to pro vide a structure whereby such purpose may be readily and conveniently accomplished, all as will be hereinafter more fully described and claimed.

Referring to the accompanying drawin which is made a part hereof and on which similar reference characters indicate similar parts,

Figure 1 is a View of a portion of a grate of the type referred to in end elevation, one 25 of the grate bars being shown in cross section to illustrate the construction more clearly and Figure 2, a side elevation, one end of the bar being shown in section to illustrate the construction more clearly.

The grate bars 10 are in themselves of any particular form desired, the form illustrated being shown only for the purpose of illustrating the invention. Each bar is hollow and preferably provided with an angular top perforated as shown. The several bars composing the grate are each connected near one end to a hollow blast intake pipe 11 and in the opposite extreme end each bar is formed with an opening closed bya door 12. Each door is provided with hinge-parts 18 and they are mounted onpintles or cross pins 14 which are secured in the sides of the bar. Underneath each grate bar, near the end containing the opening and the door 12, is mounted a shaft 15 journalled in suitable hearings on the under sides of the grate bars and extending entirely across the grate. Opposite each door 12 a curved arm or a cam 16 is secured on said shaft adapted to bear against the outer face of the d0or-as best illustrated in Figure 2. An op.- erating lever 17 is mounted upon said shaft.

Serial No. 291,337.

Said cams 16 are each formed with a straight face 20 adapted to support the door when in open position.

It will thus be seen that by swingii'ig the lever 17 from the position shown in whole lines to the position shown in dotted lines in Figure 2 cam 16 will operate to swing door 12 inwardly on its hinge 14 and support said door in a horizontal position as illustrated by dotted lines in said figure. The swinging of shaft 15 operates the entire series of cams l6 and doors 12 as will be readily understood. When the doors are swung open in this manner the blast immediately drives from the grate bars the accumulation of ashes, cinders, etc. thus serving to quickly clean the grate without interfering with the and swinging inwardly, a curved arm pivoted adjacent the door and adapted to swing with its extremity within the bar and a cam carried upon the extremity adapted to engage and open the door and provided with. means for supporting the door in open position and cooperating with the door to prevent return movement of the arm,

2. The combination with a hollow grate bar, of a door hin ed at its upper edge to swing within one end of the bar, a curved arm fulcrumed adjacent to the door and adapted to swing with its extremity moving the door within the bar, and provided on its outer edge with a portion struck upon a chord of the are with the fulcrum as the center said. portion adapted to form a support for the door in its open position.

3, The combination with a hollow grate bar of a door hinged at its upper end to swing within one end of the bar, and an arm fulcrumed adjacent to the door and adapted to swing with one end moving the door within the bar and provided on said end with a flat surface for supporting the this 14th day of April, A. D. nineteen hundoor in its open position and co-operating clrecl and nineteen.

with a flat surface on the door to prevent H r return movement of the arm, substantially lHOMAS LOUIS LA MALIA' 5 as set forth. Witnesses:

In witness whereofll have hereunto set MATT DWYER, my hand and seal at Memphis, Tennessee, W. H. IRWIN. 

